Sodium sulphide pellet



' sodium sulphide in pellet form read Patented Jan. 15, 1929.

UNITED STATES PATENT OFFICE.

BENJAMIN 3005, OF BERLIN, GERMANY, ASSIGNOR OF ONE-HALF TO THE BOESSLEB &

EASSLAOHEE CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW" 'sonIUM summon PELLET.

No Drawing. ilpplication filed November 18, 1924, Serial No. 749,894, and in Germany January 18 1924.

This invention relates to the productionfof or shipment and for dissolving, and has or its object to reduce waste and produce this material in pellets of substatiall uniform size better adapted to be quickly dissolved.

' Heretofore, one way of making sodium sulphide has been by casting it into blocks for shipment to consumers but this is open to the objection of being unsatisfactory where V the material is dissolved in water as such blocks are usually of a relatively large size and therefore do not dissolve readily, or else if the blocks be made small, the casting of small blocks becomes prohibitive in cost. Another way in which the material has been prepared is by grinding, rolling, cutting, hammering,

and the like until in the form of finely di vided particles and chips, but these particles are not all of the same size and'therefore do not dissolve-uniformly in water, or if the parsatisfactory to handle;

' tions are overcome by pouring the material ticles are all finely divided, there is waste in powder or dust which gets lost and is not According to this in ention these objecwhile molten in small streams whereby sub- 'stantially spherical pellets are formed. in falling. For cooling the pellets are dropped into trichlorethylene maintained at a temperature below the melting point of the sodium sulphide.

Sodium sulphide containing less water than that required for its crystallization as Na S.-

9H O and preferably so far dehydrated that it contains 60%or more by weight of Na S is fused in any suitable container and is theIi size.

which the fusion is poured; by variation of the pressures under which it is forced out unis made continuous it may be advanta eous to prov1de means for cooling the trio orethylene so as to avoid too great losses by evaporation. This ma conveniently be accomplished by circulating the trichlorethylene by means of a pump thru a separate container containing cooling coils.

Among the advantages of this invention may be mentioned the attainment of the material in small particles of substantially uniform size so that all are dissolved readily and in about the same time. Another advantage resides in the freedom from waste in dust, which dust under'the prior art methods became lost in handling.- A further advantage lies in obtaining the foregoing benefits at .small cost. Also by using the cooling liquid,

no great heights are necessary and the pellets may be dropped only a few feet or less, the, cooling being done by the liquid.

I claim: 7

1. Sodium sulphide in readill soluble form, comprising a quantity of su stantialy spherical pellets of substantially uniform 2. As an article of manufacture, sodium sulphide in the form of substantially spherical pellets. I a

3. As-an article of manufacture, sodium sulphide in'pellet form, containing more than 60% bylweight of sodium sulphide.

Signed at- New York city in the county of New. York and State of New Yorkthis 328th day of October, A. D. 1924.

BENJAMIN ROOS. 

